dnsdist: Clarify that versions < 1.9.0 are not affected

Signed-off-by: Remi Gacogne <remi.gacogne@powerdns.com>

diff --git a/pdns/dnsdistdist/docs/security-advisories/powerdns-advisory-for-dnsdist-2025-05.rst b/pdns/dnsdistdist/docs/security-advisories/powerdns-advisory-for-dnsdist-2025-05.rst
index f7304b1d2e97eface424b75d4446027b8e62de32..b1bea80bb78a8fa543abc67530173b82800e0496 100644 (file)
--- a/pdns/dnsdistdist/docs/security-advisories/powerdns-advisory-for-dnsdist-2025-05.rst
+++ b/pdns/dnsdistdist/docs/security-advisories/powerdns-advisory-for-dnsdist-2025-05.rst
@@ -5,20 +5,21 @@ PowerDNS Security Advisory 2025-05 for DNSdist: Denial of service via crafted Do
 - Date: 2025-09-18T12:00:00+02:00
 - Discovery date: 2025-08-26T00:00:00+02:00
 - Affects: PowerDNS DNSdist from 1.9.0 to 1.9.10, 2.0.0
-- Not affected: PowerDNS DNSdist 1.9.11, 2.0.1
+- Not affected: PowerDNS DNSdist < 1.9.0, 1.9.11, 2.0.1
 - Severity: Low
 - Impact: Denial of service
 - Exploit: This problem can be triggered by an attacker crafting a DoH exchange
 - Risk of system compromise: None
 - Solution: Upgrade to patched version or use the h2o provider
 - CWE: CWE-835
-- CVSS: AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
-- Last affected: 2.0.0
-- First fixed: 2.0.1
+- CVSS: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
+- Last affected: 1.9.10,2.0.0
+- First fixed: 1.9.11,2.0.1
 - Internal ID: 308
 
 In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.
+The offending code was introduced in DNSdist 1.9.0-alpha1 so previous versions are not affected.
 
 `CVSS Score: 3.7 <https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L&version=3.1>`__
 
-The remedy is: upgrade to the patched version, or switch to the h2o provider.
+The remedy is: upgrade to a patched version, or switch to the h2o provider.